Spark plug



Sept. 19, 1939. FOWLER 2,173,607

SPARK PLUG Filed Sept. 16, 1937 ,9. Qua-Fm, INVENTOR.

- ATTORNEY.

Patented Sept. 19, 1939 UNITED STATES PATENT OFFICE iOIaim.

plugs, and has for one of its objects to keep th sparking away from the main combustion zone of the cylinder, to ignite the charge away from 5 the cylinder, and to more completely distribu the flaming gases for better ignition.

Referring to the accompanying drawing. P18. 1 is a front elevation, partly in section, illustrating a suitable form of plug, embodying an applica- 10 tion of my invention. Fig. 2 is a back view looking up at the same. Fig. 3 is similar to Fig. 1, but with modifications, and Fig. 4 is a view looking up at Fig. 3.

The upper part 4 may be of porcelain, provided with the usual metallic unit 5, through which 15 projects the lower porcelain end 6, and the terminal I insulated therein. The other terminal 8 is adjacent thereto for-providing the usual sparking gap. The shank of nut 5 is threaded at 9 to engage skirt ll, alsothreaded at II to en-- gage the cylinder easing as usual.

The skirt I2 is dated as shownto allow the ignited gases to spread, and the interior or the skirt is grooved to'whirlthe out-coming gases My invention relates to improvements in spark so that there is a good diffusion of flame throughout the cylinder with each firing. The sparking Joints being up within the skirt are cleared by the out-rushing burnt gases, and the plug stands up much larger than when the points are in the 5 cylinder. 7

The modification shown in Figs. 3 and 4 show a shorter skirt and no grooves to whirl the gases, and while cheaper to manufacture, is not as good as the form shown in Figs. 1 and 2. 1 01 course it will be understood that various modifications may be made in the construction and arrangement of parts without departing from the spirit of the invention, as claimed.

I claim: 1 A spark plug or the character described having a plug adapter flared from top to bottom and adapted to be secured through the cylinder 01 a motor, a removable upper portion thereon having sparking terminals within and above the open end or said skirt, and slightly spiraled grooves upon the inside of said skirt to whirl the gases therefrom;

JOHN D. rownaa. 

